CN100578232C - Method and circuit of obtaining wave shape trigger signal of oscilloscope - Google Patents
Method and circuit of obtaining wave shape trigger signal of oscilloscope Download PDFInfo
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- CN100578232C CN100578232C CN200610063314A CN200610063314A CN100578232C CN 100578232 C CN100578232 C CN 100578232C CN 200610063314 A CN200610063314 A CN 200610063314A CN 200610063314 A CN200610063314 A CN 200610063314A CN 100578232 C CN100578232 C CN 100578232C
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Abstract
The invention discloses oscilloscope obtaining waveform trigger signal method and circuit. The method includes the following steps: real time sampling for the trigger source signal to gain waveform digital signal; setting trigger level and storing it in trigger level register; using digital comparator to compare waveform digital signal with trigger level to gain compared impulse; using latch to store rising edge or falling edge of the compared impulse to gain waveform trigger signal. It has the advantages of simple circuit, precise and reliable gained waveform trigger signal, low circuit cost etc.
Description
Technical field
The present invention relates to the oscillograph technology, relate in particular to the method and a kind of circuit that produces wave shape trigger signal that obtain wave shape trigger signal in the oscillograph.
Background technology
Oscillograph is widely used in each technical field, and develops to the digital circuit direction gradually from original mimic channel mode, and the volume that has of digital circuit urinates in carrying, and the circuit performance excellence more and more wins people's favor.No matter and be analog oscilloscope or digital oscilloscope circuit, obtain wave shape trigger signal and be necessary means and process that oscillograph realizes showing synchronously and stably tested waveform.
The oscillograph of prior art adopts Method and circuits as shown in Figure 1 to obtain wave shape trigger signal.At first adopt mechanical switch or electronic switch to switch and select the triggering source, promptly selecting A channel or the measured signal of B passage as required still is the triggering source of external signal as wave shape trigger signal, and adopt mechanical switch or electronic switch switching signal coupling channel, select triggering source coupling scheme; Because the trigger signal source difference of selecting for use; its signal amplitude, frequency, input impedance are also different, therefore need to use the amplifier that has than high input impedance and input protection circuit, strong overload capacity and enough bandwidth that trigger source signal is amplified to certain amplitude.In order to obtain wave shape trigger signal, also adjustable triggering level to be arranged, prior art is generally produced different data and sends digital to analog converter (D/A converter) to by data line according to user demand control by CPU, exports corresponding different DC level as triggering comparative level by D/A converter; At last, trigger source signal and triggering comparative level produce the square wave trigger pip with certain amplitude by a comparer and shaping circuit.
As can be seen from the above description, select triggering source and the source of triggering coupling scheme owing to will adopt mechanical switch or electronic switch to switch, and signaling switch must satisfy the bandwidth and the amplitude requirement of signal, therefore the device that uses is many and to the requirement on devices height; Because comparer produces wave shape trigger signal by two simulating signals are compared, the circuit devcie that trigger source signal is handled is to work under emulation mode always, therefore to the requirement height of device, be difficult to guarantee the consistance of device performance, cause the circuit consistance poor; And, be easy to occur the problem of phase mutual interference between the signal source owing to the flow process complexity of signal.
Summary of the invention
Technical matters to be solved by this invention is: a kind of Method and circuits that obtains wave shape trigger signal is provided, uses this Method and circuits on oscillograph, can obtain wave shape trigger signal simple and direct, reliably, and circuit cost is low.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
A kind of method of obtaining wave shape trigger signal may further comprise the steps:
A, at least one trigger source signal is set;
B, one trigger source signal is carried out real-time sampling, obtain waveform digital signal with A/D converter; Set triggering level, and triggering level is deposited with in the triggering level register, described triggering level is set according to user demand by the CPU of system of Oscillograph, and described system CPU is regulated triggering level by the data content of rewriting the triggering level register;
C, employing digital comparator compare in real time to described waveform digital signal and triggering level, obtain relatively pulse in real time;
D, utilize latch that the rising edge or the negative edge of described relatively pulse are latched, obtain wave shape trigger signal;
E, before new round sampling beginning, remove described latch by a control signal, make latch put 0.
Described method, wherein: described step C comprises following processing: it is identical with the figure place of described A/D converter and triggering level register that described digital comparator is set, when the waveform digital signal of A/D converter output during more than or equal to triggering level, digital comparator is output as high level, when the waveform digital signal of A/D converter output during less than triggering level, digital comparator is output as low level, obtains relatively pulse in real time.
Described method, wherein: when trigger source signal when being a plurality of, described method is obtained the wave shape trigger signal of the different trigger source signal of a plurality of correspondences according to step B, C, D, E, and selects wherein a wave shape trigger signal as the wave shape trigger signal of current use by system CPU control.
A kind of wave shape trigger signal circuit that obtains comprises system CPU, system's A/D converter, and triggering level register, and described system A/D converter is used for trigger source signal is carried out real-time sampling, obtains waveform digital signal; Described triggering level register is used to deposit triggering level, and this register is connected with described system CPU, and described system CPU changes triggering level by the content of rewriting the triggering level register, also comprises:
Digital comparator and latch, wherein, described digital comparator is connected with the triggering level register with described A/D converter respectively, be used for waveform digital signal and triggering level are compared, obtain the comparison pulse, described digital comparator is identical with the figure place of described A/D converter and triggering level register;
Described latch, be connected with system CPU with described digital comparator respectively, be used for the rising or the negative edge of relatively pulse are latched, obtain wave shape trigger signal, and before new sampling begins, send a control signal by described system CPU and remove described latch, make latch output zero setting.
Described circuit, wherein: described triggering level register, digital comparator and latch are arranged in the fpga chip.
Beneficial effect of the present invention is: because the present invention adopts the digital processing mode to obtain wave shape trigger signal, its method is simple and direct, has simplified circuit structure, has the wave shape trigger signal of obtaining simultaneously accurately, reliably, the advantage that circuit cost is low; And realize because the adjusting of triggering level changes the triggering level content of registers by system CPU, thus the selection of trigger pip and control procedure is simple, easily.
Description of drawings
Fig. 1 obtains the circuit block diagram of wave shape trigger signal for prior art;
Fig. 2 obtains the circuit block diagram of wave shape trigger signal for the present invention;
Fig. 3 is a comparer course of work synoptic diagram of the present invention.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
Main thought of the present invention is with the digital mode processing signals, all converts oscillograph trigger source signal and triggering level to digital signal, and by digital comparator they is compared, and produces real-time digital trigger signal.
The circuit that obtains wave shape trigger signal as shown in Figure 2, CPU and A/D converter are the intrinsic circuit of digital oscilloscope system among the figure, A/D converter is used for trigger source signal is carried out real-time sampling, obtain waveform digital signal, trigger source signal can have a plurality of in the oscillograph, as trigger source signal, or external signal is as trigger source signal as the measured signal of A channel or B passage, and A/D converter only carries out real-time sampling to one of them trigger source signal.With the exception of this, obtain the wave shape trigger signal circuit and also comprise a triggering level register, this register is used to deposit triggering level, and register is connected with system CPU, the size of triggering level is controlled by system CPU, system CPU changes the triggering level value according to user demand by the content of rewriting the triggering level register, this shows, the control of triggering level is become very easy.A digital comparator that is connected with the triggering level register with A/D converter respectively, digital comparator is identical with the figure place of A/D converter and triggering level register, the port of digital comparator delivered to waveform digital signal and triggering level respectively by A/D converter and triggering level register, in digital comparator, compare, thereby obtain a string relatively pulse.Can be well understood to very much the course of work of digital comparator from Fig. 3, the figure place of supposing digital comparator, A/D converter, triggering level register three all is 4, and the triggering level data are set is 2, according to the digital comparator principle as can be known, when the waveform digital signal of A/D converter output during less than triggering level 2, digital comparator is output as low level " 0 ", when the waveform digital signal of A/D converter output during more than or equal to triggering level 2, digital comparator is output as high level " 1 ", obtains a string relatively pulse thus.For the output noise of filtering digital comparator, also adopt the output signal of the global clock signal real-time sampling digital comparator of system of Oscillograph.
Obtain the wave shape trigger signal circuit and also comprise a latch that is connected with digital comparator, latch latchs the rising or the negative edge of relatively pulse, promptly when rising edge that compares pulse or decline arrival, latches high level ' 1 ' signal finally obtains the wave shape trigger signal with a rising edge (or negative edge).Simultaneously, latch is controlled by system CPU, before new sampling begins, sends a control signal by system CPU and removes described latch, makes latch output put 0, so that wait for new trigger pip.Preferred implementation of the present invention is that latch latchs the rising edge of relatively pulse, finally obtains the wave shape trigger signal with a rising edge.The principle of work of latch and circuit structure are those skilled in the art to be known, and does not repeat them here.
In order to satisfy the demand on using, oscillograph need switch the wave shape trigger signal that obtains to derive from different trigger source signal.For the present invention, a plurality of trigger source signal that the corresponding oscillograph of the present invention is provided with are provided with multichannel and obtain the wave shape trigger signal circuit, every road obtain the wave shape trigger signal circuit to the trigger source signal of correspondence carry out real-time sampling, waveform digital signal that sampling is obtained compares and latchs with triggering level, obtain wave shape trigger signal that should trigger source signal, system CPU respectively obtains the wave shape trigger signal circuit by control, selects and switch to obtain required trigger pip.Therefore this shows that the present invention no longer needs electronics or mechanical switch to switch and selects the triggering source, the selection of trigger pip and control procedure are become very simple, easily, and be easy to integratedly, help reducing system cost, reduced volume.
Because what circuit of the present invention adopted all is digital units, the programmable logic device (PLD) that can utilize digital oscilloscope is integrated into triggering level register, digital comparator and the latch on each road in the programmable logic device (PLD), as be arranged in the fpga chip, the clock signal is produced by the phase locked-loop unit in the fpga chip, the content of its triggering level register by system CPU by reading and writing with the data communication bus of FPGA, so, reduce cost significantly, also improved reliability of products simultaneously.
Should be understood that, for those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and design thereof, and all these changes or replacement all should belong to the protection domain of the appended claim of the present invention.
Claims (5)
1, a kind of method of obtaining wave shape trigger signal may further comprise the steps:
A, at least one trigger source signal is set;
B, one trigger source signal is carried out real-time sampling, obtain waveform digital signal with A/D converter; Set triggering level, and triggering level is deposited with in the triggering level register, described triggering level is set according to user demand by the CPU of system of Oscillograph, and described system CPU is regulated triggering level by the data content of rewriting the triggering level register;
C, employing digital comparator compare in real time to described waveform digital signal and triggering level, obtain relatively pulse in real time;
D, utilize latch that the rising edge or the negative edge of described relatively pulse are latched, obtain wave shape trigger signal;
E, before new round sampling beginning, remove described latch by a control signal, make latch put 0.
2, method according to claim 1, it is characterized in that: described step C comprises following processing: it is identical with the figure place of described A/D converter and triggering level register that described digital comparator is set, when the waveform digital signal of A/D converter output during more than or equal to triggering level, digital comparator is output as high level, when the waveform digital signal of A/D converter output during less than triggering level, digital comparator is output as low level, obtains relatively pulse in real time.
3, method according to claim 2, it is characterized in that: when trigger source signal when being a plurality of, described method is obtained the wave shape trigger signal of the different trigger source signal of a plurality of correspondences according to step B, C, D, E, and selects wherein a wave shape trigger signal as the wave shape trigger signal of current use by system CPU control.
4, a kind of wave shape trigger signal circuit that obtains, comprise system CPU, system's A/D converter, and triggering level register, described system A/D converter is used for trigger source signal is carried out real-time sampling, obtains waveform digital signal, and described triggering level register is used to deposit triggering level, this register is connected with described system CPU, and described system CPU changes triggering level by the content of rewriting the triggering level register; It is characterized in that: also comprise digital comparator and latch, wherein, described digital comparator is connected with the triggering level register with described A/D converter respectively, be used for waveform digital signal and triggering level are compared, obtain the comparison pulse, described digital comparator is identical with the figure place of described A/D converter and triggering level register;
Described latch, be connected with system CPU with described digital comparator respectively, be used for the rising or the negative edge of relatively pulse are latched, obtain wave shape trigger signal, and before new sampling begins, send a control signal by described system CPU and remove described latch, make latch output zero setting.
5, circuit according to claim 4 is characterized in that: described triggering level register, digital comparator and latch are arranged in the fpga chip.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103901243A (en) * | 2012-12-25 | 2014-07-02 | 北京普源精电科技有限公司 | High-trigger-accuracy oscilloscope |
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| CN100504400C (en) * | 2007-09-11 | 2009-06-24 | 电子科技大学 | Oscilloscope high speed signal reconstruction method |
| CN102147426B (en) * | 2010-11-18 | 2013-01-16 | 电子科技大学 | Broadband triggering circuit of digital oscilloscope |
| CN103439648B (en) * | 2013-08-08 | 2016-05-04 | 北京华大信安科技有限公司 | A kind of verification method, device and chip |
| CN105548641A (en) * | 2015-12-15 | 2016-05-04 | 大豪信息技术（威海）有限公司 | Waveform triggering device and method and oscilloscope for waveform triggering |
| CN106053908A (en) * | 2016-07-06 | 2016-10-26 | 电子科技大学 | Analog-to-digital signal conversion device of digital oscilloscope |
| CN106568996B (en) * | 2016-11-17 | 2019-03-05 | 中国电子科技集团公司第四十一研究所 | A kind of efficient low distortion digital oscilloscope training signal generating circuit and method |
| WO2019169524A1 (en) * | 2018-03-05 | 2019-09-12 | 深圳市汇顶科技股份有限公司 | Method and device for detecting waveform signal |
| CN110501546A (en) * | 2019-07-31 | 2019-11-26 | 苏州浪潮智能科技有限公司 | A kind of oscillograph |
| CN111487447B (en) * | 2020-05-09 | 2022-06-28 | 深圳市鼎阳科技股份有限公司 | Digital oscilloscope for realizing rapid measurement |
| CN113777376B (en) * | 2021-09-27 | 2024-03-22 | 广东工业大学 | Triggering system and triggering method of oscilloscope |
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Cited By (1)
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